Guide head for drill steels



Patented July 2, 1929.

UNITED STATES LPATENT'OFFICBJ- CHARLES C. HANSEN, 0F EASTON,PENNSYLVANIA, ASSIGNOR TO INGER-SOLL-RAND COMPANY, OF JERSEY CITY, NEWJERSEY, A CORPORATIONOF NEW JERSEY.

GUIDE HEAD FOR DRILL STEELS.

Application filed September 26, 1928. Serial No. 308,507.

This invention relates to rock drills, but

more particularly to a guide for the working implement such as drillsteels actuated by rock drills of the hammer type.

One object of the invent on is to gu1de and support the overhangingport1on of the working implement and another ob e ct is to insure theretention of the guide 1 n both the operative and inoperative positions.This, in the present instance, 1s accomplished by the same meansordlnarlly used for clamping the guide arms in the operative position.

Other objects will be in partobvious and in part pointed outhereinafter.

In the drawings illustrating the invention and in which similarreference characters refer to similar parts,

Figure 1 is a side elevation of a front end of a rock drill shell havingthe inventlon applied thereto,

Figure 2 is a transverse view taken through Figure 1 on the line 22looking in the direction indicated by the arrows, and

Figure 3 is a plan view of the guide showing a modification of theinvention.

Referring more particularly to the drawings, A represents the front endof a rock drill shell and B the front head of a rock drill for which theshell A forms a guide. The shell A is provided with lugs C to su portside bolts D' whiehin turn pivotal y support at their front ends arms Ecomprising a guide for a working implement F which projects into thefront head B to receive the blows of a hammer piston (not shown).

The arms E may be in most respects s1milar to those commonly employedfor guiding drill steels and accordingly have recesses G in adjacentsurfaces which in the closed position of the arms E register and form aguideway for guiding the drill steel F.

The arms E are provided at their outer ends with the usual grooves Hformed in the sides of the arms and extend over the tops thereof toreceive a U-clamp J whereby the arms E are held in the operative POSI-tion for guiding the drill steel F.

When changing drill steels in the drill, the U-clamp J is removed fromthe grooves H and the side arms are then rocked rearwardly of the shellA to a position similar to that illustrated in dot and dash lines intendency of the side arms to swing for wardly to the operative orguiding position. In order therefore to insure the retention of theguide arms in the inoperative position, the said guide arms are providedwith apertures K into which the U-clamp J may be disposed for thepurpose of holding said side arms immovable during the changing of thedrill steel F, thus serving the dual function of holding the side armsout of the inoperative position and also of providing a definite placein which the U-clamp J may be disposed while such changes are takingplace to assure against the possibility of mislaying or losing of theU-clamp.

In the modification illustrated in Figure 3, grooves L are formed on theinner or adjacent surfaces of the side arms E. These grooves L lie inthe same transverse lane as the grooves H which they join at the uppersurfaces of the side arms E. The grooves L are preferably of such depththat when the side arms E are rocked rearwardly to the inoperativeposition illustrated, and wherein said grooves L will occupysubstantially the same relative positions with respect to each other asthe groovesH in the operative position, the U-clamp J may be readilydisposed therein to retain the side arms E out of the guiding position.

The following is a brief description of the operation of the device.Normally during the drilling of rock, the side arms E will occupy aposition toform a guide for the drill steel F. The guiding or operativepo-' sition of the side arms E is illustrated in Figures 1 and 2. Inthis position of the guide arms, the U-clamp J will be disposed in thegrooves H and will remain seated in said grooves unaffected by thevibration incident to drilling. Whenever it is desired to change thedrill steel, the U-clamp J is removed from the grooves H and the sidearms are then rocked about the side bolts D to a position wherein theU-clamp J may be disposed in the apertures K to hold the side arms Erearwardly of the shell. After the drill steel has been inserted in thefront head B, the side arms are again rocked to their guiding positionand the U-clamp J is disposed in the grooves H to hold the guide arms inthe operative position.

I claim: 7

1. A guide for drill steels comprising a pair of varms adapted to bepivotally connected to a rock drill shell, said arms having recessesadapted to register for guiding a drill steel, a 'U-clamp, andindentations in the arms to receive the U-clamp for bothsecuring thearms in the operative and inoperative positions.

2. A guide comprising a. pair of arms adapted to be pivotally connectedto a rock drill shell, said arms having recesses in adjacent sidesregistering in the operative position of the arms to slidably receiveand guide a drill steel, a U-clamp, grooves in the free ends of the armsin the sides thereof to receive the U-clamp for holding the arms inposition to guide the drill steel, and apertures in the armsintermediate their ends for the reception of the =U-clamp to hold thearms in the inoperative position.

In testimony whereof I have signed this specification.

CHARLES C. HANSEN.

